Power supply ripple probe and power supply ripple detection system

Abstract

The utility model discloses a power supply ripple probe and a power supply ripple detection system. The power supply ripple probe comprises: a first probe, a second probe, a low-noise amplifier circuit and an antenna interface; wherein the first probe is connected to the input end of the low-noise amplifier circuit and is used to connect the positive electrode of the power supply to be tested; the second probe is grounded and is used to connect the negative electrode of the power supply to be tested; the output end of the low-noise amplifier is connected to the antenna interface, and the antenna interface is used to connect an oscilloscope. The power supply ripple probe has low cost and strong practicality.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply detection, in particular to a power supply ripple probe and a power supply ripple detection system. Background Art

[0002] In related technologies, after the module is designed, it needs to be tested on the baseband, and the power supply ripple test is an evaluation of the quality of the power supply voltage output in the baseband test. For testing, an oscilloscope and a probe are used, but high-end probes are expensive and have complex functions. Buying them just for ripple testing will cause unnecessary waste. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the purpose of the utility model is to provide a power supply ripple probe and a power supply ripple detection system, wherein the power supply ripple probe has low cost and strong practicality.

[0004] To achieve the above-mentioned purpose, the first aspect of the utility model proposes a power supply ripple probe, comprising: a first probe, a second probe, a low-noise amplifier circuit and an antenna interface; wherein the first probe is connected to the input end of the low-noise amplifier circuit and is used to connect the positive electrode of the power supply to be tested; the second probe is grounded and is used to connect the negative electrode of the power supply to be tested; the output end of the low-noise amplifier circuit is connected to the antenna interface, and the antenna interface is used to connect an oscilloscope.

[0005] In addition, the power supply ripple probe of the utility model may also have the following additional technical features:

[0006] In some examples, the power supply ripple probe further includes: a probe pad configured to place the first probe and the second probe.

[0007] In some examples, the number of the first probe and / or the second probe is plural.

[0008] In some examples, the low-noise amplifier circuit includes: a first capacitor, a first end of the first capacitor is connected to the first probe; a low-noise amplifier, an input end of the low-noise amplifier is connected to the second end of the first capacitor, and an output end of the low-noise amplifier is connected to the antenna interface.

[0009] In some examples, the low-noise amplifier circuit also includes: a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor and a first inductor; wherein the first end of the first inductor is connected to the second end of the first capacitor, and the second end of the first inductor is connected to the input end of the low-noise amplifier; the first end of the first resistor is connected to the control end of the low-noise amplifier, and the second end of the first resistor is used to input a control signal; the first end of the second capacitor is connected to and grounded to the first ground end of the low-noise amplifier, and the second end of the second capacitor is connected to the power supply end of the low-noise amplifier; the first end of the third capacitor is connected to the control end of the low-noise amplifier, and the second end of the third capacitor is grounded; the first end of the fourth capacitor is connected to the output end of the low-noise amplifier, and the second end of the fourth capacitor is connected to the antenna interface; the first end of the fifth capacitor is connected to the output end of the low-noise amplifier, and the second end of the fifth capacitor is grounded; the first end of the sixth capacitor is connected to the antenna interface, and the second end of the sixth capacitor is grounded.

[0010] In some examples, the power supply ripple probe further includes: a power supply unit connected to a power supply terminal of the low noise amplifier to supply power to the low noise amplifier.

[0011] In some examples, the power supply unit includes: a DC regulated power supply and a low voltage dropout linear regulator; wherein the negative terminal of the DC regulated power supply is grounded, the positive terminal of the DC regulated power supply is connected to the input terminal of the low voltage dropout linear regulator, and the output terminal of the low voltage dropout linear regulator is connected to the power supply terminal of the low noise amplifier.

[0012] In some examples, the power supply unit also includes: a second resistor, a seventh capacitor, an eighth capacitor and a ninth capacitor; wherein the first end of the seventh capacitor is connected to the input end of the low voltage difference linear regulator, and the second end of the seventh capacitor is grounded; the first end of the second resistor is connected to the input end of the low voltage difference linear regulator, and the second end of the second resistor is connected to the enable end of the low voltage difference linear regulator; the first end of the eighth capacitor is grounded, and the second end of the eighth capacitor is connected to the input end of the low voltage difference linear regulator; the ground end of the low voltage difference linear regulator is grounded; the first end of the ninth capacitor is connected to the output end of the low voltage difference linear regulator, and the second end of the ninth capacitor is grounded.

[0013] In some examples, the antenna interface uses an SMA-KE high-frequency antenna socket, wherein the SMA-KE high-frequency antenna socket is used to connect to the oscilloscope via a coaxial cable.

[0014] To achieve the above object, the second aspect of the utility model provides a power ripple detection system, comprising: an oscilloscope and the above power ripple probe.

[0015] The power supply ripple probe and the power supply ripple detection system of the utility model have low cost and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural block diagram of a power supply ripple probe according to an embodiment of the utility model;

[0017] Figure 2 This is a circuit topology diagram of a power supply ripple probe according to an embodiment of the utility model;

[0018] Figure 3 It is a circuit topology diagram of a power supply unit of an embodiment of the utility model;

[0019] Figure 4 It is a structural block diagram of a power ripple detection system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The power supply ripple probe and the power supply ripple detection system of the embodiments of the utility model are described below with reference to the accompanying drawings.

[0022] Figure 1 The utility model is a structural block diagram of a power supply ripple probe according to an embodiment of the utility model.

[0023] like Figure 1 As shown, the power supply ripple probe 100 includes: a first probe 101, a second probe 102, a low-noise amplifier circuit 103 and an antenna interface 104; wherein the first probe 101 is connected to the input end of the low-noise amplifier circuit 103 and is used to connect the positive electrode of the power supply to be tested; the second probe 102 is grounded and is used to connect the negative electrode of the power supply to be tested; the output end of the low-noise amplifier circuit 103 is connected to the antenna interface 104, and the antenna interface 104 is used to connect an oscilloscope.

[0024] The power supply ripple probe of the embodiment of the utility model has low cost and strong practicality.

[0025] In some embodiments, Figure 2 As shown, the power ripple probe 100 further includes a probe pad 105 configured to place the first probe 101 and the second probe 102 .

[0026] In some embodiments, Figure 2As shown, there are multiple first probes 101 and / or second probes 102 .

[0027] Specifically, Figure 2 As shown, the probe pad 105 can be a patch pad with a preset spacing, which is convenient for connecting probes and the probe spacing can be manually adjusted; for example, interfaces 4 and 5 of the probe pad 105 are respectively connected to a first probe 101, and interfaces 1, 2, and 3 of the probe pad 105 are respectively connected to a second probe 102.

[0028] In some embodiments, the low noise amplifier circuit 103 includes: a first capacitor 1031, and a low noise amplifier 1032; wherein the first end of the first capacitor 1031 is connected to the first probe 101; the input end AI of the low noise amplifier 1032 is connected to the second end of the first capacitor 1031, and the output end of the low noise amplifier 1032 is connected to the antenna interface 104.

[0029] Specifically, by adjusting the probes at different intervals to access the power supply to be tested, the signal enters from the probes, and when it reaches the first capacitor 1031 , the DC signal is isolated, and the AC signal passes.

[0030] In some embodiments, Figure 2 As shown, the power ripple probe 100 further includes: a power supply unit 106 connected to a power supply terminal VCC of the low noise amplifier 1032 to supply power to the low noise amplifier 1032 .

[0031] In some embodiments, Figure 2As shown, the low noise amplifier circuit 103 also includes: a second capacitor 1033, a third capacitor 1034, a fourth capacitor 1035, a fifth capacitor 1036, a sixth capacitor 1037, a first resistor 1038 and a first inductor 1039; wherein the first end of the first inductor 1039 is connected to the second end of the first capacitor 1031, and the second end of the first inductor 1039 is connected to the input end AI of the low noise amplifier 1032; the first end of the first resistor 1038 is connected to the control end C of the low noise amplifier 1032, and the second end of the first resistor 1038 is used to input a control signal; the first end of the second capacitor 1033 is connected to the first ground end GN of the low noise amplifier 1032 D1 is connected and grounded, the second end of the second capacitor 1033 is connected to the power supply terminal VCC of the low noise amplifier 1032; the first end of the third capacitor 1034 is connected to the control terminal C of the low noise amplifier 1032, and the second end of the third capacitor 1034 is grounded; the first end of the fourth capacitor 1035 is connected to the output terminal AO of the low noise amplifier 1032, and the second end of the fourth capacitor 1035 is connected to the antenna interface 104; the first end of the fifth capacitor 1036 is connected to the output terminal AO of the low noise amplifier 1032, and the second end of the fifth capacitor 1036 is grounded; the first end of the sixth capacitor 1037 is connected to the antenna interface 104, and the second end of the sixth capacitor 1037 is grounded. Among them, the control signal is, for example: when the control signal is high level, the low noise amplifier 1032 works, and when the control signal is low level, the low noise amplifier 1032 does not work. The low noise amplifier 1032 also has a second ground terminal GND2.

[0032] Specifically, when the AC signal comes to the low noise amplifier 1032, the low noise amplifier 1032 amplifies the signal and reduces the noise generated in the process, thereby improving the signal-to-noise ratio of the signal and avoiding the serious noise interference problem generated by other amplifiers when amplifying the signal.

[0033] In this embodiment, the second capacitor 1033 is used to filter and stabilize the voltage output by the power supply unit 106; the third capacitor 1034 is connected through the control terminal C of the low-noise amplifier 1032 to prevent voltage jitter and filter out noise; the fourth capacitor 1035 has the same function as the first capacitor 1031; the fifth capacitor 1036 and the sixth capacitor 1037 are used for filtering; the first resistor 1038 is used as a pull-up resistor for current limiting; the first inductor 1039 is used to select signals of a specific frequency and reduce noise.

[0034] In some embodiments, Figure 3As shown, the power supply unit 106 includes: a DC regulated power supply 1061 and a low voltage difference linear regulator 1062; wherein, the negative terminal of the DC regulated power supply 1061 is grounded, the positive terminal of the DC regulated power supply 1061 is connected to the input terminal VIN of the low voltage difference linear regulator 1062, and the output terminal VOUT of the low voltage difference linear regulator 1062 is connected to the power supply terminal VCC of the low noise amplifier 1032.

[0035] In some embodiments, Figure 3 As shown, the power supply unit 106 also includes: a second resistor 1063, a seventh capacitor 1064, an eighth capacitor 1065 and a ninth capacitor 1066; wherein, the first end of the seventh capacitor 1064 is connected to the input end VIN of the low voltage difference linear regulator 1062, and the second end of the seventh capacitor 1064 is grounded; the first end of the second resistor 1063 is connected to the input end VIN of the low voltage difference linear regulator 1062, and the second end of the second resistor 1063 is connected to the enable end EN of the low voltage difference linear regulator 1062; the first end of the eighth capacitor 1065 is grounded, and the second end of the eighth capacitor 1065 is connected to the input end VIN of the low voltage difference linear regulator 1062; the ground end GND3 of the low voltage difference linear regulator 1062 is grounded; the first end of the ninth capacitor 1066 is connected to the output end VOUT of the low voltage difference linear regulator 1062, and the second end of the ninth capacitor 1066 is grounded.

[0036] Specifically, a DC stabilized power supply 1061 is used to supply power, and the voltage is stepped down by a low voltage drop linear regulator 1062 to provide power supply terminal VCC of the low noise amplifier 1032. The specific values ​​of the resistors and capacitors used in the design refer to the device specifications added during the design, and are designed according to different requirements.

[0037] In this embodiment, the second resistor 1063 is used to directly pull up the voltage input by the DC regulated power supply 1061 to the enable terminal EN of the low voltage difference linear regulator 1062 to play a current limiting role; the seventh capacitor 1064, the eighth capacitor 1065 and the ninth capacitor 1066 are filter capacitors.

[0038] In some embodiments, Figure 2 As shown, the antenna interface 104 uses a SMA-KE high-frequency antenna base 1041, wherein the SMA-KE high-frequency antenna base 1041 is used to connect to an oscilloscope via a coaxial cable.

[0039] Specifically, the AC signal is amplified and connected to the coaxial cable through the high-frequency antenna base, input into the oscilloscope, and processed and displayed by the oscilloscope. When designing the power supply ripple probe 100 circuit, attention should be paid to the impedance matching problem of the circuit.

[0040] In summary, the power supply ripple probe of the embodiment of the utility model sets a capacitor in the circuit to isolate DC absorption, uses a low-noise amplifier to optimize the signal, and connects to an oscilloscope via a coaxial cable, thereby completing the test of power supply ripple at a relatively low cost.

[0041] Figure 4 It is a structural block diagram of a power ripple detection system according to an embodiment of the utility model.

[0042] like Figure 4 As shown, the power ripple detection system 400 includes: an oscilloscope 401 and the above-mentioned power ripple probe 100 .

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A power ripple probe, characterized in that: include: A first probe, a second probe, a low noise amplifier circuit and an antenna interface; wherein, The first probe is connected to the input end of the low-noise amplifier circuit and is used to connect to the positive electrode of the power supply to be tested; the second probe is grounded and is used to connect to the negative electrode of the power supply to be tested; The output end of the low noise amplifier circuit is connected to the antenna interface, and the antenna interface is used to connect to an oscilloscope.

2. The power supply ripple probe according to claim 1, characterized in that: Also includes: The probe pad is configured to place the first probe and the second probe.

3. The power supply ripple probe according to claim 1 or 2, characterized in that: The number of the first probe and / or the second probe is plural.

4. The power supply ripple probe according to claim 1, characterized in that: The low noise amplifier circuit comprises: a first capacitor, wherein a first end of the first capacitor is connected to the first probe; A low noise amplifier, wherein an input end of the low noise amplifier is connected to the second end of the first capacitor, and an output end of the low noise amplifier is connected to the antenna interface.

5. The power supply ripple probe according to claim 4, characterized in that: The low-noise amplifier circuit further includes: a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor and a first inductor; Among them, the first end of the first inductor is connected to the second end of the first capacitor, and the second end of the first inductor is connected to the input end of the low noise amplifier; the first end of the first resistor is connected to the control end of the low noise amplifier, and the second end of the first resistor is used to input a control signal; the first end of the second capacitor is connected to the first grounding end of the low noise amplifier and grounded, and the second end of the second capacitor is connected to the power supply end of the low noise amplifier; the first end of the third capacitor is connected to the control end of the low noise amplifier, and the second end of the third capacitor is grounded; the first end of the fourth capacitor is connected to the output end of the low noise amplifier, and the second end of the fourth capacitor is connected to the antenna interface; the first end of the fifth capacitor is connected to the output end of the low noise amplifier, and the second end of the fifth capacitor is grounded; the first end of the sixth capacitor is connected to the antenna interface, and the second end of the sixth capacitor is grounded.

6. The power supply ripple probe according to claim 4 or 5, characterized in that: Also includes: A power supply unit is connected to the power supply terminal of the low noise amplifier to supply power to the low noise amplifier.

7. The power supply ripple probe according to claim 6, characterized in that: The power supply unit includes: a DC regulated power supply and a low voltage drop linear regulator; The negative terminal of the DC regulated power supply is grounded, the positive terminal of the DC regulated power supply is connected to the input terminal of the low voltage drop linear regulator, and the output terminal of the low voltage drop linear regulator is connected to the power supply terminal of the low noise amplifier.

8. The power ripple probe according to claim 7, characterized in that: The power supply unit further includes: a second resistor, a seventh capacitor, an eighth capacitor and a ninth capacitor; Among them, the first end of the seventh capacitor is connected to the input end of the low voltage difference linear regulator, and the second end of the seventh capacitor is grounded; the first end of the second resistor is connected to the input end of the low voltage difference linear regulator, and the second end of the second resistor is connected to the enable end of the low voltage difference linear regulator; the first end of the eighth capacitor is grounded, and the second end of the eighth capacitor is connected to the input end of the low voltage difference linear regulator; the ground end of the low voltage difference linear regulator is grounded; the first end of the ninth capacitor is connected to the output end of the low voltage difference linear regulator, and the second end of the ninth capacitor is grounded.

9. The power supply ripple probe according to claim 1, characterized in that: The antenna interface adopts an SMA-KE high-frequency antenna seat, wherein the SMA-KE high-frequency antenna seat is used to connect the oscilloscope via a coaxial cable.

10. A power ripple detection system, characterized in that: include: An oscilloscope and a power supply ripple probe according to any one of claims 1 to 9.

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